The latest surge of migrants crossing the Balkans has brought a record number to Hungary despite government efforts to quickly build a 4-meter (13-foot) high fence on the Serbian border to stop them.

According to police data, 2,093 migrants were detained Monday, the highest figure so far this year. Over the past week, the daily average was of 1,493 migrants.

Government spokesman Zoltan Kovacs said Tuesday that "unsustainable conditions" would develop in Budapest and other large European cities unless concerted efforts were made to establish "some kind or order or regularity" regarding the flow of migrants.

About 140,000 migrants have reached Hungary this year, over three times as many as in all of 2014, but most quickly leave for richer European Union countries like Germany or the Netherlands.